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Sinapis arvensis  L.
[=Brassica kaber  (DC. ) Wheeler]
Mitchell County, Kansas
Height: 8 to 32 inches
Family: Brassicaceae - Mustard Family
Flowering Period:   May, June, July
Also Called: Wild mustard.
Stems: Erect, branched above, bristly-hairy or glabrous.
Leaves: Alternate, simple, stalked below, sessile above, egg-shaped or rhombic, 2-8 inches long, 1-4 inches wide; margins coarsely toothed or sometimes lobed; upper leaves progressively smaller, rhombic to oblong; tips pointed.
Inflorescences: Raceme, terminal.
Flowers: Conspicuous, about 3/5 inch wide; sepals 4, in 2 opposite pairs; petals 4, pale yellow, diagonal to sepals.
Fruits: Pods, linear, 1/2 to 3/4 inch long, mostly glabrous, ascending, with prominent, flattened beak about 1/2 inch long; seeds 7-13, nearly spherical, black to purplish brown.
Habitat: Waste ground, gardens, cultivated fields, and roadsides.
Distribution: Throughout Kansas.
Origin: Introduced from Europe.
Toxicity: Will occasionally accumulate toxic concentrations of nitrates.
Comments: Charlock can be a problem weed. Its seeds can survive in the ground for a long time.
 See Brassica juncea , a related species.

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Mitchell County, Kansas
140 KB
Mitchell County, Kansas
137 KB
Mitchell County, Kansas